Friction-top can.



T. GRAHAM.

FRICTION TOP CAN.

nruoumn rum) Inga, 1911.

1',.,02%,074.' Patented Apr; 2, 1912.

I rwmQrQ v Tami; arm v 9 9 'rHoM'As GRAHAM, or AI/rfM RE, MA

coMPANY, on NEW YORK, 11., Y.,

RYLAND, ASSIGNOR '10 AMERICAN CAN A CORPORATION OE JERSEY FRICTION-TOP can.

Application filed January 13, 1911. Serial No. eoaaoa.

To all whom it may concern Be it known that I, Tironas-Gnxinur, a

' citizen of .the United States, residing in the have invented a new and thus having a bar 'tion flange of the locking the friction cap or cover very firmly State of Maryland,

useful Improveof which the folcity' of Baltimore and ment in Friction-Top Cans,

lowing is a specification. v

My invent'on relates to improvements 1n friction top cans.

The object of my invention is to provide an improved construction offriction top.

can by which an extraordinary tight closure may be obtained, and the friction cap, plug or cover securely held or locked in position within the friction seat wall or flange'of at the furnished at small cost. To practically accomplish this object or result, and herein my invention consists, I provide the vertical or substantially cylindrical friction seat wall of the friction cap, plugor e( )yer with a minute, .circumferentially exteiiiiii g score in the horizontal planecf the lower edge of the depending friction seat wall orflange of the top head when the cap or cover is forced home, where'it will be'engaged, with more or less of a spring-like action by the lower inner edgeof the depending friction scat-wall or flange of the top head, the score the bur edge of the fricconjunction with top head'ln holding and and securely in place" 'and. thereby very I greatlyadding to the tightness and perfection of the closure. v

- Inthe-accompanying,drawing forming a part of this specificatlon, Figure 1' 1s a central, vertical section of a friction plug oyster can embodying any invention. Fig. .Z-is a plan view. Fig. 3 is a detail, partial, vertical section on line-3-3 of Fig. 1. Fig. 4 is an enlarged detail section in which the thickness of the sheet Inetalor tin plate and the depth and size of the locking score 111 the peripheral wall ofgthe plug is greatly exaggerated to betterillustrat'e the inven 5 is an enlarged, detail elevation tion. Fig.

of the friction cap plug or cover of the'can. -In the-drawing, I have illustrated'my invention as apphed to an oyster shipping can, in which class of cans itis particularly useful, as they ordinarlly'have a-- bottom '-lil(e or locking action in Patented Apr; 2, 1912.

head of soft, light, tin plate adapting be readily cut out to open the can. In this to. i

kind of cans, the circui'nstance that the fries tion cap or plug of my improved can is capable of being removed only .withigreat ditliculty, is of no consequence o1 objection, as consumers ordinarily open these'cans by cutting out thesoft tin bottom head. i

In the drawing, 1 represents the body of the can,'2 its bottom head soldered thereto, preferably made of thin, soft tin adapted to be readily cut out, is the top head soldered to the body and provided with a depending friction seat wall or flange 4, surrounding its filling opening 5. The fricticn seat wall or flange i has the customary inward spring action and bur 6 at its extrclne inner lower edge. The'top head 3 is further provided with raised s'tifi'ening bosses? at each side of therentral opening, and with curved, transversely extending raised .ribs 8 adjacent to its friction flange or'seat wall and with an annular recess or seat 9 to receive the outstanding pryofl rim or flange 10 off the friction cap plug or cover 11.

The friction cap, plug or cover, (as this member is commonly. or variously termed)" has a substantially cylindrical but sligl'dly tapering friction's'eat wall 12 adapted-to. very tightly fit. and engage'the correspond;

ing friction seat wall or flange 4 of thetop head, and it is provided with a veryfinej or -1ninute circumferential score 13 extending" around it in a horizontal plane, and o-n'wa level wlth or. at the depth'of the extreme lower edge or bur 6 of the friction flange or seat wall t of thetop head,'and adapted to be engaged thereby with more or less of a barb-likeor spring action, and thus serve to very securely hold and lock the friction cap in place and cause the closure to be one of extraordinary tightness and security. This score 13 in the peripheral friction seat- .wall of the cap 11 may, in practice, be so fine thatv it can scarcely be seen with the naked eye and scarcely felt with the finger nail, and I find'in practice that it will nevertheless serve to hold and lock the friction cap so securely-'inplace that it can be pried oil" or removed only with greatdifliculty. To enable it, however, to be pried oil or removed when desired, the adjacent inclined wall 14 of the raised rib 8 is continued to intersect with the horizontal face of the reicessor, seat which rec ei'ves the pry-oft rim f'10 ofpthe friction cap or plug. This enables a; pointed or blade-like instrument to be wedgedunder thepry-ofl' rim of the fric-' 131011 cap. The raised ribs 8' of the top head serve as pry-off rims or fulcrums in removmg the cover, as do alsothe portions of the seam 'ri'm 16 which unites the top head to the body ofthe can f 10 The circumferentially extending locking score 13 on the friction seat wall of the cap llg i s preferably of V shape in cross section, :as will'be readily understood from the exaggerated' representation of it in Fig. 4, and

the'lower wall of the V groove preferably makes a greater angle to the vertical than friction cap.

the upper wallto increase the barb-like action of the scorein resisting removal of the As in my invention, the interengaging friction seat walls of bothmembers, the top head and friction cap, are'made of plain Shape, without distortion, folding or groov- V and snugly;

ing of the sheet metal, both partsare adapted to be very cheaply manufactured and also to be forced or wedged together very-tightly As in my invention, the circumferential fine score 13 on the external friction seat wall 12 of the friction cap 11 produces no external hump, rib or projection on the smooth friction seat wall 12, it does not in-' 'terfere with the necessary close metal to -metal contact of the friction faces' or walls of the cap and top' head when the parts are forced together,. and thus enables a fluid Itighti closure to be practically secured by simply driving or forcing the cap into the cheaply closed the oyster packing factory. v

ing thin, soft metalbottom heads to be cut out, the can 1s opened ordinarily without removing t-hefrlctlon cap 11. In cases, however, where myinvention is used in, cans not having thin, soft, metal bottom heads, they may be opened, although. with some difficulty, by prying off the friction covers. In practicing. my invention, if the friction cap is forced in closing the can so far in that the l/Vhere my invention is used in cans havcircumferential score 13 comes a little below the lower edge 6 of the top headflange 4, the score will still be effective in preventing the removal or displacement of the-cover, as it will be engaged by the bur at the lower edge of the top head flange if the 1 cover should move slightly upward or outward.

v The stiffening bosses 7 and raised ribs 8 serve to stiffen the top head of the can and adapt it to resist the pressure of the pistonor plunger of the closing machine in forcing the cover tightly into the can.

Iclaim:- 1. In a friction top can, the combination with a top' head having a depending friction seat wall flange, of a cooperating friction closure member having a friction seat wall provided with a fine, circumferential score engaging the inner lower edge of the friction seat wall flange-of the top head to hold and lock said member in place and increasethe tightness of the closure, substantially as specified.

2. In a friction top can, the combination 7 with a top head having a depending friction seat wall flange with an inward spring ac tion at its lower edge, of a friction'cap'hav' ing a friction seat wall provided with an external,circumferential score engaging the,

lower edge of the friction seat wall flange of the top head with a barb-like locklng action to hold the friction capjin position and cffeet a tight closure, substantially as specified.

THOMAS G AHAM. -Witnesses:

FRANK MURPHY,

IRVING L. Fonrr. 

